Q7 of 19 Page 60

Give Scientific reasons.

Tungsten metal is used to make a solenoid type coil in an electric bulb.

Tungsten is a strong metal with the high melting point of 3380oC. When bulb glows a large amount of heat is produced and the temperature is also very high. So tungsten is used which can resist this huge amount of heat and high temperature.


More from this chapter

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5

Which device is used to produce electricity? Describe with a neat diagram.

a. Electric motor


b. Galvanometer


c. Electric Generator (DC)


d. Voltmeter

 6

How does the short circuit form? What is its effect?

 7

Give Scientific reasons.

In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster etc, an alloy such as Nichrome is used, not pure metals.

 7

Give Scientific reasons.

For electric power transmission, copper or aluminum wire is used.